Cap for lamp-sockets and the like.



C. J KLEIN.

C AP FOR LAMP SOCKET AND THE LIKE. APPLICATION FILED APR. 8, 1912.

1,142,819. Patented June 15, 1915. I I

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U E S ATE PATENT OFFICE.

CHARLES J'. KLEIN, OF MILWAUKEE, WISCONSIN, AS SIGNOR TO THE CUTLER-HAMMER MFG. 00., 0F MILWAUKEE, WISCONSIN, ACORPORATION OF WISCONSIN. v

CAP FOR LAMP-SdQXETS AND THE LIKE.

A Specification of Letters Patent. Patented J une 15, 1915,

Application filed April 8, 1912. Serial No. 689,292.

To all whom it may concern Be it known that I. CHARLES J. KLEIN, a citizen of the United States, residing at Milwaukee, in the county of 'Milwaukee and State of Wisconsin, have invented new and useful Improvements in Caps for Lamp- Socketsjand the like, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to improvements in caps for lamp sockets, pendant switches and devices of a similar character.

It is one object of my invention to provide an improved insulating lining for such caps.

A further object is to provide an improved insulating lining which need not be removed when subjecting the cap to acid or other treatments for obtaining the desired finish.

A still further object of my invention is to provide a cap having an insulating lining secured therein in a simple and efficient I manner.

vention will be later explained.

For the purpose of more fully and clearly disclosing my invention, I shall describe the embodiment thereof illustrated in the accompanying drawing. It should be understood however, that my invention is not limited to the specific embodiment thereof selected for the purpose of illustration.

In the accompanying drawings: Figure 1 is a vertical sectional view through the cap, and Fig. 2 is a bottom plan view of the cap.

The insulating lining shown which is a preferred form comprises a dish shaped metallic member 1 closely fitting within the dome 2 of the cap and having a central opening 3 therein registering with the opening of the cap-nipple 4. The inner surface of the lining member is provided with an insulating covering 5 preferably comprising an'insulating glaze or enamel. The lining member 1 is preferably formed of copper to facilitate the glazing or enameling thereof. In practice the lining may be secured within the cap in any preferred manner. I prefer however, to secure the lining in place in such a manner as that illustrated.

In the construction shown, the lining is secured in place Without the provision of any special retaining means therefor. The cap which is of the same general construction as that disclosed in my co-pending application, Serial No. 660,345, filed Nov. 15, 1911, is formed in two parts. One part consists of the dome member 2 which is provided at its lower end with an annular flange 6. The other part comprises a shell engaging member 7 having its upper edge spun or beaded on to the flange 6 of the dome memher, as indicated at 8. With this construction the lining member may be readily secured within the cap by providin the same with an annular flange 9, fitting c osely against the flange 6 of the dome member and beading or spinning the edge of the shell engaging member around both flanges. The

lining is thus firmly clamped between the 7 two parts of the cap. The cap and lining are thus embodied in a rigid unitary structure with no loose parts Whatever. The in-' sulating glazing or enameling may be read ily made to Withstand any of the acid or other treatmentsto which a cap is subjected for finishing. The glaze or enamel being placed upon a metallic base it is fully reinforced. The lining as a Whole may be readily and inexpensively produced. A lining so constructed is strong and durable. It has advantages over porcelain, fiber and other linings in that it is not subjected to shrinkage and warpage.

The construction as a whole is particularly advantageous in that all parts thereof including the lining are secured together by a common means. This entirely obviates the necessity for providing special lining retaining means.

What I claim as new and desire to secure by Letters Patent is:

1. A cap for lamp sockets and the like having a separate rigid metallic lining clamped therein between portions of the wall of said cap, said lining having a glazed or enameled insulating surface.

2. A cap for lamp sockets and the like. formed in sections and an insulating lining for the dome member thereof having portions clamped between the sections of the cap.

3. A cap for lamp sockets and the like comprising a dome member, an insulating lining, a shell engaging member and a common means for securing all of said parts together.

4. A cap for lamp sockets and the like comprising a dome member, a shell engaging member and an insulating lining, said scribed my name in the presence of two Witlining and one of said cap membershaving nesses. annular flanges and the other" cap member having a portion spun or beaded ovensaid 5 flanges to secure all of said members to Witnesses: r

gether. FRANK II; HUBBARD,

1f CHARLES J. KLEIN.

Inwitnes s whereof, I have hereunto subi I v H. L. ROCKWELL. 

